Are the Percy's Seal-4-Good (dead-soft aluminum) head gaskets still a good choice?

I have a ticking noise on my headers which is pointing towards my header gaskets. My TTi gaskets appear to have made it for about 4 years or so and I need to replace them.
I did an internet search and the Percy's and the Cometic's seem to be the two top choices. My local parts store can get the Percy's, so I am leaning towards them for my 340.

http://www.summitracing.com/parts/PHP-66037/

Thanks


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)